Attorneys for Manafort said that they needed more time to review some 120,000 pages of documents, including documents and images taken from electronic devices belonging to Manafort's former business partner Rick Gates, that were "at the heart of the issue" in the case. Prosecutors pushed back and said most of the documents were actually images and notes from Gates' devices – not emails.

Mueller's team has four "phones or iPads" and one laptop belonging to Gates, who pleaded guilty earlier this year and has been cooperating with the investigation. He is expected to be a key witness in Mueller's case.

Manafort's cases relate to consulting and lobbying work he did on behalf of pro-Russian politicians in Ukraine, including fugitive ex-president Viktor Yanukovych.

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